如何将内联 SQL 转换为 SQL Server 中的存储过程答案

【问题标题】：How to convert Inline SQL to a stored procedure in SQL Server如何将内联 SQL 转换为 SQL Server 中的存储过程
【发布时间】：2014-11-11 05:15:14
【问题描述】：

下面显示的我的代码是作为内联 SQL 语句创建的。这段代码怎么写成存储过程？？

代码是：

public Stream SelectEmployeeImageByID(int theID)
{
        SqlConnection connection = new SqlConnection(ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString.ToString());
        string sql = "SELECT Image FROM Employees WHERE EmployeeId = @EmployeeId";
        SqlCommand cmd = new SqlCommand(sql, connection);
        cmd.CommandType = CommandType.Text;
        cmd.Parameters.AddWithValue("@EmployeeId", theID);

        connection.Open();
        object theImg = cmd.ExecuteScalar();

        try
        {
            return new MemoryStream((byte[])theImg);
        }
        catch
        {
            return null;
        }
        finally
        {
            connection.Close();
        }
    }

【问题讨论】：

stackoverflow.com/questions/1260952/…
做一些研究。检查此 URL：stackoverflow.com/questions/1260952/…。除此之外，还有很多例子，用google吧。

标签： c# asp.net sql-server sql-server-2008

【解决方案1】：

你可以这样做

create procedure SelectEmployeeImage(@employee int)
as
begin
   SELECT Image FROM Employees WHERE EmployeeId = @EmployeeId 
end

那么你的代码就是这个形式

public Stream SelectEmployeeImageByID(int theID)
    {
        SqlConnection connection = new SqlConnection(ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString.ToString());
        string sql = "SelectEmployeeImage";
        SqlCommand cmd = new SqlCommand(sql, connection);
        cmd.CommandType = CommandType.StoredProcedure;
        cmd.Parameters.AddWithValue("@EmployeeId", theID);
        connection.Open();
        object theImg = cmd.ExecuteScalar();
        try
        {
            return new MemoryStream((byte[])theImg);
        }
        catch
        {
            return null;
        }
        finally
        {
            connection.Close();
        }
    }

希望对你有帮助

【讨论】：

【解决方案2】：

创建存储过程

Create procedure SP_InsertEmployee
as
@EmployeeId int 
BEGIN

SELECT Image FROM Employees WHERE EmployeeId=@EmployeeId

END

你应该设置CommandType=StoredProcedure，其余的都一样

cmd.CommandType = CommandType.StoredProcedure;

建议

始终使用using，它会自动处理连接

using (SqlConnection con = new SqlConnection())
{
con.open();
using (SqlCommand cmd = new SqlCommand(sql, connection))
{

//object theImg = cmd.ExecuteScalar();

}

con.Dispose();
}

【讨论】：